Mandrel.



J. W. SWARTZLANDER.

MANDREL. APPLICATION IIL'ED APR.27, 1910.

1,016,587. I Patented Feb. e, 1912.

D In;

JIIIIF I Wu. 7 PM! Attorneys COLUMBIA PLANKJGRAPH COQWASHINGTDN, u. c.

JAIVIES W. SWARTZLANDER, 0F COALINGA, CALIFORNIA.

MANDREL.

owest.

Specification of Letters Patent.

Patented Feb. 6, 1912.

Application filed April 27, 1910. Serial No. 558,013.

To all whom it may concern Be it known that I, JAMES W. SWARTZ- LANDER, a citizen of the United States, residing at Coalinga, in the county of Fresno and State of California, have invented certain new and useful Improvements in Mandrels; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to devices for use in connection with oil wells and consists of certain new and useful improvements in mandrels whereby a mandrel is constructed with rolls for the purpose of rolling and smoothing the interior surface of the piping or casing of an oil well, without removing such piping or casing from the well.

As clearly shown in Figure 1 of the drawings, the recesses in which the rollers are mounted, are located in the main body, adjacent to each end thereof, the said rollers being preferably placed at the extremities of the straight portion of the sides of the main body, so that a considerable space intervenes between the difierent series of rollers. By this arrangement the mandrel when in use in a pipe section, is automatically steadied, and its axis is maintained, coincident with the axis of the pipe.

It frequently happens that the pipes or casings of oil wells are indented or buckled in the course of being placed in an oil well, and it is very expensive to remove the said piping from the well in order to straighten it.

The object of my invention is to produce a device which may be used to remove any indentations which may occur, or to straighten a bend in the said pipe or any sections thereof, without removing it from the well.

In order that my invention may be understood, I have illustrated it in the accompanying drawings and described it in the specification following. I

In the drawing, Fig. 1 is a side view of one form of my improved mandrel, a part being broken away. Fig. 2 is a transverse section on line m-w, Fig. 1.

Similar letters of reference indicate identical parts throughout.

A represents the main body of my improved mandrel and consists preferably of a solid heavy piece of metal, preferably formed as shown in Fig. 1, its diameter being less than that of the piping. The upper and lower portions of the main body A are recessed as at a, a to receive rollers B, B. These rollers B, B are mounted in re cesses which extend circumferentially around the main body A, on shafts which pass through said main body on each side of said recesses, and the distance between the outer surfaces of oppositely disposed rollers, at their outermost portions, is such that when the \device is used in pipe sections, portions of the surfaces of said rollers extend beyond the main body A and contact with the inner surface of the said pipe sec tions.

It will be observed that spaces 0 are necessarily left between the rollers to enable them to be properly journaled, and in order to roll the entire inner surface of a pipe, I arrange the upper and lower sets of rollers in such relation to each other, that a roller will be located under or over each vacant space between each roller, thus insuring a complete circular rolling surface, which will contact with the inner surface of the pipe or casing.

The main body A is designed to be removably secured to a part connected with the drilling apparatus, which part is moved up and down by mechanism such as a walking beam, provided in the derrick. In the present form I show the end of the mandrel provided with a part D, having a screw thread by which it is connected with the plunger of a drilling apparatus.

The mode of operating my improved mandrel is apparent: hen it becomes known that there is an indentation in a section of pipe sunk in an oil well, the mandrel is attached to a plunger of sufficient length and inserted in the pipe. The plunger and mandrel is then forced up and down, and the surfaces of the rollers smooth out the dents or imperfections, existing in the inner surface of the pipe. The action of the mandrel will not be materially impeded by water or sand or oil in the pipe, owing to the spaces left between each roller. It is obvious that by reason of the distance longitudinally of the main body, between the two sets of rollers, the mandrel will steady itself, and may be reciprocated within the pipe sections without buckling or bulging the piping and without being afi'ected by any unsteadiness or lateral movement of the part by which it is operated.

What I claim and ters Patent is 1. A mandrel for straightening interior indentations in pipes sunk in oil wells, comprising a main body provided with a plurality of series of rollers mounted in the sides of the main body adjacent to each end thereof, and so disposed with relation to each other that the rollers of one series shall be opposite the spaces between the rollers in another series, said main body being tapered at the ends to facilitate the operation of redesire to secure by Letciprocating the mandrel in the pipe sectlons, and being provided with means for securing said main body to a reciprocating part, operating within the pipe sections.

2. A mandrel for straightening interior indentations in pipes sunk in oil wells, comprising a main body provided with a plurality of series of rollers mounted in the sides of the main body, adjacent to each end thereof, and so disposed with relation to each other that the rollers of one series shall be opposite the spaces between the rollers in another series, and being provided with means for securing said main body to a reciprocating part, whereby when in operation in a pipe section the axis of the mandrel is maintained coincident with the axis of the pipe section, without any extraneous support, and the operation of the device is not affected by any lateral movement of the part by which it is reoiprocated.

In testimony whereof I affix my signature, in the presence of two Witnesses.

JAMES W. SWARTZLANDER.

Witnesses:

D. M. SPEED, N. A. JOHNSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. I 

